Bouncing Green Ball

int xPos;

int yPos;

int velocity;

​

void setup () {

  size (500, 500);

  xPos= width/2;

  yPos = height/2;

  velocity= 15;

​

}

void draw() {

  background (255);

  fill (0, 255, 0);

  if (yPos>= height || yPos<=0) {

    velocity=(velocity*-1);

println ("we're inside the if statement");  

}

yPos= yPos+velocity;

  ellipse (xPos, yPos, 50, 50);

  println ("velocity "+ velocity);

  println ("yPos "+yPos);

​

}